I gave this example before to a fellow player in a game who seemed to not grasp the significance of the versatility reduction with the curriculums.
Comparing a 14th level wizard: with the curriculum example given, I have a maximum of 15 different spells I can prepare in the extra slots. Under the school system, an illusion school wizard of the same level has 45 potential spells to choose from for that extra slot. That is triple the choices. Keep in mind too that I did not even count uncommon or rare spells in the second count, but did in the first.
This change is concerning to me beyond the impact of this change alone though. Any competent designer should have been able to see that this was such a drastic reduction in the wizard's choices that it would obviously result in general concern and worry over the state of the class in the remaster if seen on its own. As a result, they would (hopefully) add notes explaining that this is one part of a larger overhaul of the wizard and should not be a point of concern. Or, at the very least, they would have simply avoided including the curriculum change in the preview by itself and instead waited until it could be viewed as part of the whole with the remaster release or a preview specifically on the wizard.
The fact that the designers apparently did not have that good sense, is worrying on its own with regard to their competency for the remaster.